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# appearance

The appearance associated with the app’s windows.

```
var appearance: NSAppearance? { get set }
```

## Discussion

When the value of this property is `nil` (the default), AppKit applies the current system appearance to the app’s user interface elements, including its windows, views, panels, and popovers. Assigning an [`NSAppearance`](/documentation/AppKit/NSAppearance) object to this property causes the app’s interface elements to adopt the specified appearance instead.

Individual windows and views may still override the app’s appearance to customize their own appearance.

---

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